Video: home made carb balance tool. he's working on a GS too.

[GelandeStrasse]

https://www.youtube.com/watch?v=GaTRyHxvneY&feature=youtube_gdata_player

[GSX1000E]

Good effort that seems to work very well. It would not only be easier but also cost less (if you value your time) to just purchase the proper tool.

[GelandeStrasse]

Quite true, but I thought it was worth posting as many gs owners (myself included) buy them because they are so affordable on a tight budget that often doesn't include spare cash for an array of expensive specialized tools to fix up and ride. The $$ could be spent on tires instead
As you say though, if you can afford it, something like a carbtune will be much easier and more accurate and a great addition to your tool box.